Improvement in air-pumps



2 Sheetssneet 2. D. E. SOMES. AIR PUMP.

No. 95,613. Patented O-ot. 5, 1869.

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DANIEL E. soMEs, or WASHINGTON, Dis-Taler or COLUMBIA..

Laim Patent No. 95,613, dated 'ot-aber 5, 1869.

The Schedule referred to in these Letters Patent and malngpart of the same.

To all 'whom tt may concern i Be it known that I, DANIEL E. Sobres of' Washington, in the county of Washington, and District of Columbia, have invented a new and-useful Im- 'provement in Air-Pumps; and I d'o hereby declare that the following is a full, clear, and exact description thereof', reference being had to the accompany-' ing drawings, which make part of this specification, and in which- Figure 1 represents a vertical section of an airpump embracing my improvements; Y

Figure 2, a section through the cage o f the delivery-valve, taken at the line y y of fig. 1;

Figure 3, a section through the piston, taken at the linexxof gl;

Figure 4, a vertical section of an air-pump, showing a modification of the delivery-valve seat;

Figure 5, a similar section, in which a rest for the delivery-valve is substituted for the cage; and

Figure 6, a similar' section, in which both cage and seat are dispensed with.

The object of my invention is to provide a forcepump, for compressing air or other uids, which shall be free from the injurious effects arising from having a large amount of clearance or space 'between the piston and valves, as is found in most air-pumps of. the ordinary construction, which causes a' certain amount'of air to be rareed and compressed at every stroke without useful e'ect; andto this end,

l My improvements consist in so constructing and arranging the receiving and delivery-valves of an airof the ordinary construction, in the air-pump cover and is to be provided with a cross-head and guides, for proper connection to the driving-power.

TheY space between the centre or eye of the piston and the outer space, which contains the packing, is cored hollow, except where interrupted by the ribs or arms which unite the two portions, thus forming a passage for the air from the nozzle A to thereceivingvalve G. This valve opensY downward, and seats in the bottom 'bf the piston, as shown in figs. 1 and 5. It is guided by a spindle, c, screwed into it, and moving in ahole drilled in the end of the piston-rod.

Springs cf5 may be made use of; if desired, to hold the valve firmly to its seat when closed. They are represented as spiral in the drawings, but elliptic, vo-

lute, or any other form may be adopted, according t( convenience.

Gum or leather maybe placed upon the bottoms of the piston and receiving-valve, to prevent the noise caused by their striking' against the delivery-valve when the pump is in operation. 1

The delivery-valve-E is circular, and closes the bottom of the barrel, against which it seats. It is of equal or greater diameter than the piston B, so thatfthe latter can strike and rest upon it when at the bottom of its stroke. .v

In the arrangement shown by figs. 1 andy-'4, the valve E Works in a cage, El, within the 'deliverychamber D. This cage iscylindrical in form, boredv out on its inside, to lit the valve E, and turned on its outside, to Inake a tight joint with the chamber D.

When the valve is of greater diameter than the barrel of the pump, which is preferable to having it oi' the same diameter, it' seats against thebottom thereof, which is faced accurately, so as to' make a perfectly tight jointwith) it when closed# The air compressed by the piston passes, through the openings FF ofthe cage, into the delivery-chamber D. Springs e2 can bey added, for the purpose of keeping the valve closed tightly against its seat.

Fig. 4 showsa modification of the pump, in which the delivery-valve is of the same diameter as, the cylinder. In this case, the valve is provided'with a guard,y

e, to prevent it ii'om lifting too far. rllhe deliverychamber and cage are connected to the barrel by suitable ground or packed joints, as may be deemed preferable; and the bottom ofthe chamber may form the 'bed-plate, ihr fastening the pump in position, as exemplified in fig. 5. One or more nozzles,.D, are cast upon the chamber D, to which pipes can be attached,

to conveyV the compressedair'to'any desired point. Y

` material, to ease the shock of the valve in striking it,

or the valve' may rest upon the springs alone. The

top of the valve should have a similar facing, either around its edge, orover its whole surface, to serve both as packing, and to prevent the piston from striking it with noise.

A hole is drilled in the rest, in which a stem, j;

i of the chamber, may be employed for the purpose ol keeping the valve to its seat, which, as in the case of the receiving-valve, may be of any suitable form; and, it' it is desired, for reducing friction, the stem f may be dispensed with, and the springs will regulate the course of the valve with suficient accuracy.

lfVlien4 tbe piston is at the bottom of its stroke, it rests upon the delivery-valve E, and communication between the barrel A and chamberl Dis closed. When it commences to be raised, the pressure in the chamber D, together with the force of tbc springs, causes the valve E to rise with it until it strikes its seat. (From an inspection of the parte, it will be readily seen that it is impossible for any air to find its way back between the valve and piston, or into tlie barrel A.) The valve Etben being closed, and the piston continuing to rise, there is a tendency to form a vacnnln between it and the valve E, which is couuteracted by tbe atmospheric pressure above the piston, which forces down the valve C, and rushes in to lill the space between the piston and delivery-valve, and continues to do so until the piston has reached the top of its stroke. As soon as the piston begins its downward stroke, the pressure ofthe air beneath it, together with the springs c2, closes the valve (land the air in the barrel, being compressed, forces down the valve E, and rushes into the chamber D. This continues until the piston strikes tbe valve E, when another upward stroke is commenced, and the operation before described is repeated- Having thus fully described my improved airpump,

What I claim therein as new, and desire to secure by Letters Patent, is-

lhe delivery-valve E, eduction-valve C, nozzle A', stufiing-box, and piston-rod B', in combination with tbe cylinder A and pistou B, substantially as described.

D. E. SOMES.

Witnesses CHARLES HERRON, WILLIAM: HUFF. 

